Pitot Static Leak Check Operation
100465-01
Instructions for conducting the pitot-static-AOA leak check with the test equipment.
CAUTION:
The airspeed and altimeter are delicate instruments. Care must be taken when applying pressure to the pitot-static system to avoid pressures and rapid changes of pressure that could damage the instruments.
Task Instructions
1. On the front panel of the PS-525 tester, ensure that the Pressure Pump and Vacuum Pump switches are both OFF.
2. Close the Pressure Control and Vacuum Control and Crossbleed valves by rotating clockwise until they seat.
Note:
DO NOT Over tighten the valves
3. Open the Pressure Vent and Vacuum Vent valves.
4. Ensure that the Pressure Reservoir and Vacuum Reservoir gages indicate 0 psi and 0 inHg respectively.
5. Power on the PS-525 to 12 volts by pulling up on the power switch in the center of the box to unlock, then swinging the switch down to +12 V.
Note:
The system will go through a boot cycle then should display as shown in the top photo with a variation in altitude depending on the ambient conditions of the day. Note the altitude shown as a reference for future steps.
Note:
For greater accuracy, the tester should be powered on for 15 minutes before use.
6. Close the Pressure Vent and Vacuum Vent valves.
7. Switch on the Pressure Pump until it reads 10-15 psi.
8. Switch on the Vacuum Pump until it reads 15-20 inHg.
9. Open the Crossbleed valve.
10. Carefully open the Vacuum Control valve. It will turn approximately 3/4 of a turn (counter-clockwise) before the valve opens. Climb the altitude on the display no faster than 4,000 ft/min to approximately 1000 ft greater than the indicated number with the Vacuum Control valve closed and the Vacuum Vent open. Carefully close the Vacuum Control valve.
Note:
In the above example the altitude should be increased to approximately 1066 ft.
Note:
Should you exceed the desired altitude, carefully open the Vacuum Vent to bleed off the altitude until the desired altitude is indicated.
11. Carefully close the Crossbleed valve by turning clockwise.
12. Carefully open the Pressure Control valve. It will turn approximately 3/4 of a turn before the valve opens. Increase the indicated airspeed on the display to 100 knots. Carefully close the Pressure Control valve.
13. Look at the airspeed indicator in the cockpit and verify that the indicated airspeed is within 5 knots of what is displayed on the PS-525 airspeed display.
14. Press the Leak Check button under the Airspeed display.
15. Press Leak Check two more times until the screen indicates 60 sec, then press the Units button to start the leak check.
Note:
The ICON standard is no more than a 5-knot total leak over 60 seconds.
16. Press Exit on the Airspeed display.
17. Press the Leak Check button under the Altitude display.
18. Press Leak Check two more times until the screen indicates 60 sec, then press the Units button to start the leak check.
Note:
The ICON standard is no more than a 50 feet total leak over 60 seconds.
19. Press Exit on the Altitude display.
20. Return the system to ambient pressures by carefully opening the Crossbleed valve ensuring not to exceed 4,000 ft/min on the Altitude display. Proceed until the Airspeed display shows 0.0 knots.
21. Lower the altitude by carefully opening the Pressure Vent ensuring not to exceed 4,000 ft/min on the Altitude display.
22. Close the Crossbleed valve.
23. Carefully open the Pressure Control valve to bring the Pressure Reservoir indicator to 0 psi.
24. Carefully open the Vacuum Vent valve.
25. Carefully open the Vacuum Control valve until the Vacuum Reservoir indicator shows 0 inHg.
26. Open the Crossbleed valve for storage.
27. Turn the PS-525 tester unit power to Display Off.
28. Record the results of the pitot leak check and static leak check in the Verification Method form of the parent task. (Pitot-Static-AOA
Leak Test Procedures)
Parent topic